Widespread Geographic Distribution of Oral Candida dubliniensis Strains in Human Immunodeficiency Virus-Infected Individuals
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1 JOURNAL OF CLINICAL MICROBIOLOGY, Apr. 1997, p Vol. 35, No /97/$ Copyright 1997, American Society for Microbiology Widespread Geographic Distribution of Oral Candida dubliniensis Strains in Human Immunodeficiency Virus-Infected Individuals DEREK SULLIVAN, 1 KEN HAYNES, 2 JACQUES BILLE, 3 PATRICK BOERLIN, 3 LAURA RODERO, 4 SIOBHÁN LLOYD, 1 MARTIN HENMAN, 5 AND DAVID COLEMAN 1 * Department of Oral Medicine and Pathology, School of Dental Science and Dublin Dental Hospital, 1 and Department of Pharmacology, School of Pharmacy, 5 Trinity College, University of Dublin, Dublin 2, Republic of Ireland; Department of Infectious Diseases and Bacteriology, Royal Postgraduate Medical School, Hammersmith Hospital, London W12 0NN, United Kingdom 2 ; Institute of Microbiology, University Hospital, CH-1011 Lausanne, Switzerland 3 ; and Instituto Nacional de Microbiologia Dr. Carlos G. Malbran, Buenos Aires 1281, Argentina 4 Received 22 November 1996/Returned for modification 19 December 1996/Accepted 9 January 1997 Candida dubliniensis is a recently identified chlamydospore-positive yeast species associated with oral candidiasis in human immunodeficiency virus (HIV)-infected (HIV ) patients and is closely related to Candida albicans. Several recent reports have described atypical oral Candida isolates with phenotypic and genetic properties similar to those of C. dubliniensis. In this study 10 atypical chlamydospore-positive oral isolates from HIV patients in Switzerland, the United Kingdom, and Argentina and 1 isolate from an HIV-negative Irish subject were compared to reference strains of C. albicans and Candida stellatoidea and reference strains of C. dubliniensis recovered from Irish and Australian HIV individuals. All 11 isolates were phenotypically and genetically similar to and phylogenetically identical to C. dubliniensis. These findings demonstrate that the geographical distribution of C. dubliniensis is widespread, and it is likely that it is a significant constituent of the normal oral flora with the potential to cause oral candidiasis, particularly in immunocompromised patients. * Corresponding author. Mailing address: University of Dublin, School of Dental Science, Dental School Office, Trinity College, Dublin 2, Republic of Ireland. Phone: Fax: address: dcoleman@mail.tcd.ie. Present address: Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada. Recently several independent reports have described the recovery of atypical chlamydospore-positive oral Candida isolates from human immunodeficiency virus (HIV)-infected and AIDS patients in Ireland, the United Kingdom, Switzerland, and Australia which were not readily identifiable as any known Candida species by conventional mycological procedures (1 4, 7, 8, 11 15). In one of these reports, detailed phenotypic, molecular, and phylogenetic studies of a collection of 64 of these isolates from 55 separate Irish and Australian HIVinfected and AIDS patients and 2 isolates from separate HIVnegative Irish subjects demonstrated that they formed a homogeneous cluster that was significantly different from the other species of the genus Candida (13). These atypical isolates were considered to be sufficiently distinct to constitute a novel species of Candida, for which the name Candida dubliniensis has been proposed (13). Phylogenetically Candida albicans is the species most closely related to C. dubliniensis (13). The objective of this study was to determine whether chlamydospore-positive atypical oral Candida isolates from individuals in widely different geographic locations which could not be identified definitively by conventional mycological methods were C. dubliniensis. To achieve this, selected atypical oral isolates from HIV-infected individuals in Switzerland, the United Kingdom, and Argentina and from an HIV-negative Irish subject were compared with reference strains of C. albicans and Candida stellatoidea type I and with reference isolates of C. dubliniensis from HIV-infected Irish and Australian subjects by the phenotypic, molecular, and phylogenetic procedures used by Sullivan et al. (13) in the original study describing the identification of C. dubliniensis. The atypical oral isolates and reference strains used are shown in Table 1. All 11 of the atypical oral isolates tested were germ tube positive and produced pseudohyphae and abundant chlamydospores as described previously by Sullivan et al. for C. dubliniensis isolates (13). The isolates grew well at 37 C but grew poorly or not at all at 42 C, like C. stellatoidea ATCC and the Irish and Australian C. dubliniensis reference strains but unlike C. albicans 132A, which grew well at this temperature. These results are in complete agreement with previous studies of C. dubliniensis (13). Furthermore, all the atypical isolates and the reference C. dubliniensis strains tested yielded similar substrate assimilation profiles with the API ID 32C yeast identification system (biomérieux) which did not correspond precisely to any known Candida species in the API APILAB database (Table 1), as reported previously for C. dubliniensis isolates (12 14). Table 2 lists the components of the API ID 32C yeast identification kit and shows the ability of C. dubliniensis isolates to assimilate the various substrates in comparison with the substrate assimilation profiles obtained with typical strains of C. albicans. The ability to assimilate sucrose was a feature common to all the atypical isolates and the reference C. dubliniensis strains, but unlike the reference C. albicans and C. stellatoidea strains, none produced intracellular -glucosidase, determined by using methylumbelliferyl- -glucoside as a substrate as described by Boerlin et al. (2). All the reference C. dubliniensis strains and atypical isolates belonged to C. albicans serotype A, as determined by agglutination reactions with antiserum raised against Candida antigenic factor 6 (Iatron Laboratories, Tokyo, Japan). Previous studies have shown that C. dubliniensis isolates belong exclusively to C. albicans serotype A, in contrast to type I C. stellatoidea, which belong exclusively to C. albicans serotype B (3, 13, 14). Furthermore, when cultured on the recently described chromogenic substrate-containing agar CHROMagar Candida (16), the atypical isolates and reference C. dubliniensis strains 960
2 VOL. 35, 1997 NOTES 961 TABLE 1. Candida reference strains and clinical isolates Strain(s) or isolate(s) Species Source a API ID 32C profile Identification b APILAB database Species Predictive value (%) Reference(s) Reference strains 132A C. albicans Irish oral isolate (HIV ) Excellent C. albicans ATCC C. stellatoidea type I American Type Culture Excellent C. albicans 2 c Collection CD36 d C. dubliniensis Irish oral isolate (HIV ) e Unreliable C. sake CM2, CM4 C. dubliniensis Australian oral isolates (HIV ) e Unreliable C. sake , 8, 13 C. albicans2 c 48.0 Atypical isolates f CD43 Atypical Irish oral isolate (HIV ) Unreliable C. sake 49.3 This study CD70 Atypical United Kingdom oral isolate (HIV ) yielded dark-green colonies characteristic of C. dubliniensis, compared to the pale-blue-green colonies typical of C. albicans (3). All of these results indicated that the atypical isolates were phenotypically identical to C. dubliniensis (13). To confirm this, several detailed genetic tests were carried out on the reference strains and a selection of the atypical isolates. Genomic DNA was purified from each and digested with the restriction endonuclease HinfI (13) with the result that the high-molecular-weight HinfI fragments previously shown to be characteristic of C. dubliniensis (13) were evident for each of the 11 atypical isolates tested and the reference C. dubliniensis strains but not for the reference C. albicans and C. stellatoidea strains tested (data not shown). Further evidence was obtained by DNA fingerprinting analysis of EcoRI-digested genomic DNA from two of the Swiss atypical isolates (P7 and Co4) and three other atypical isolates from Ireland, the United Kingdom, and Argentina (CD43, CD70, and CD71) (Table 1) by hybridization analysis with the 32 P-labelled C. albicans-specific repeat sequence-containing DNA probe 27A (10) as described previously (13). The probe bound efficiently to the DNA from the reference C. albicans and C. stellatoidea strains tested but less efficiently to DNA from the atypical isolates in a manner characteristic of C. dubliniensis (13) (Fig. 1A). Following hybridization with the 27A probe, the same filter-bound DNA samples were fingerprinted separately by Unreliable C. sake 49.3 This study P2, P7, P21, P27, P30 Atypical Swiss oral isolates (HIV ) Unreliable C. sake CD71 Atypical Argentinian oral isolate (HIV ) Unreliable C. sake 49.3 This study Co4, Co5, Co7 Atypical Swiss oral isolates (HIV ) Unreliable C. colliculosa C. sake 8.5 a The HIV status of the patients from whom the isolates were recovered is indicated in parentheses. b Unreliable, profiles are unreliable for identification purposes and are of low discrimination in the APILAB database, corresponding to poor or unacceptable identification, in decreasing order of probability, of the species indicated. c C. stellatoidea is listed as C. albicans 2 in the API APILAB database. d CD36, the C. dubliniensis type strain, has been lodged with the British National Collection of Pathogenic Fungi (accession number NCPF 3949). Both CD36 and the Australian C. dubliniensis isolate CM2 have also been deposited with the Centraalbureau voor Schimmelcultures, Baarn, The Netherlands (accession numbers CBS 7987 and CBS 7988, respectively). e Many C. dubliniensis isolates show variable assimilation of trehalose with the ID 32C yeast identification system (13, 14). Thus, isolates which yield the profile on one occasion can yield the profile on another. However, both profiles are unreliable for identification purposes with the APILAB database. f CD43 was recovered from a patient with oral candidiasis in January 1995; CD70 was recovered in 1995 (data on oral candidiasis at sampling not available); CD71 was recovered from a patient with oral candidiasis in August sequential hybridization with five synthetic oligonucleotide probes homologous to eukaryotic microsatellite sequences, (GGAT) 4, (GATA) 4, (GACA) 4, (GTG) 5, and (GT) 8 (13). For each oligonucleotide probe the profiles of the atypical isolates and the reference strains of C. dubliniensis were very similar but easily distinguishable from the corresponding profiles of the C. albicans and C. stellatoidea reference strains [a representative fingerprint generated with probe (GTG) 5 is shown in Fig. 1B]. Similarly, randomly amplified polymorphic DNA profiles generated with the oligonucleotide primer 5 GCGATCC CCA 3 (13) with target genomic DNA from the same five atypical isolates examined by hybridization analysis were very similar to those of the reference C. dubliniensis strains used but distinctly different from the randomly amplified polymorphic DNA profiles generated with C. albicans 132A and C. stellatoidea ATCC (data not shown). The karyotype profiles of each of the five atypical isolates examined above were also examined as described previously (13), and again the reference C. dubliniensis strains and the atypical isolate profiles were very similar but readily distinguishable from those of the C. albicans and C. stellatoidea reference strains (Fig. 2). All of these results provided strong evidence that the atypical isolates tested were the same as C. dubliniensis. To determine unequivocally the identity of the atypical isolates, the nucleotide sequences of the V3 region of the large
3 962 NOTES J. CLIN. MICROBIOL. TABLE 2. Substrate assimilation by C. dubliniensis and C. albicans determined with the API ID 32C yeast identification system ID 32C assimilation profile code Substrate or test C. dubliniensis a C. albicans b Pentoses L-Arabinose D-Xylose Ribose Hexoses -Methyl-D-glucoside Galactose Glucose Sorbose Rhamnose Disaccharides Cellobiose Maltose Lactose Melibiose Sucrose Trehalose Palatinose Trisaccharides Melezitose Raffinose Alcohols Glycerol Erythritol Mannitol Inositol Sorbitol Organic acids Glucuronate DL-Lactate 2-Keto-gluconate Levulinate Gluconate Amino acids N-Acetylglucosamine Glucosamine Esculin hydrolysis Cycloheximide resistance a All C. dubliniensis isolates reported to date yielded one of the five ID 32C substrate assimilation profile codes shown (3, 13; this study). All five codes provide unreliable identification with the APILAB database. b The two C. albicans ID 32C substrate assimilation profile codes shown are commonly obtained with clinical isolates and correspond to excellent identification with the APILAB database (13). ribosomal subunit genes of the five atypical isolates examined in detail by DNA fingerprinting and karyotype analysis were compared with the corresponding sequences determined previously for a variety of other Candida species, including C. albicans, type I and type II C. stellatoidea, C. glabrata, C. kefyr, C. krusei, C. parapsilosis, and C. tropicalis (13). To achieve this, PCR products spanning approximately 600 bp of the V3 region were amplified with specific primers described previously by Sullivan et al. (13), and their nucleotide sequences were determined by using the PCR primers as sequencing primers. The nucleotide sequences of the amplimers generated from each of the five atypical isolates were found to be identical to each other and to the corresponding sequences of a total of nine separate C. dubliniensis isolates determined previously (13). Previous phylogenetic studies based on multiple sequence alignments of this sequence (EMBL nucleotide sequence database accession number X83718) and the corresponding sequence from the other Candida species listed above have shown that C. dubliniensis forms a distinct taxon within the genus Candida (13). Taken together, these data confirm that the atypical isolates described in this paper, recovered from HIV-infected patients in the United Kingdom, Switzerland, and Argentina and from an HIV-negative Irish subject, all belong to the newly de-
4 VOL. 35, 1997 NOTES 963 FIG. 1. Autoradiograms of EcoRI-digested DNA from reference Candida strains and atypical Candida isolates hybridized with the C. albicans-specific DNA fingerprinting probe 27A (A) and the oligonucleotide probe (GTG) 5 (B). Following hybridization and autoradiography, the radioactive probe was stripped from the filter used to generate the autoradiogram shown in panel A, as described previously (12), and the filter was rehybridized with 32 P-labelled (GTG) 5 probe, which, following autoradiography, generated the autoradiogram shown in panel B. The fingerprints shown correspond to C. albicans 132A (lane 1), C. stellatoidea type I strain ATCC (lane 2), the C. dubliniensis type strain (CD36) (lane 3), atypical isolate CD43 from an Irish HIV-negative individual (lane 4), atypical isolate CD70 from an English HIV-infected individual (lane 5), C. dubliniensis CM2 and CM4 from HIV-infected Australian individuals (lanes 6 and 7, respectively), atypical isolates Co4 and P7 from Swiss HIV-infected individuals (lanes 8 and 9, respectively), and atypical isolate CD71 from an Argentinian HIV-infected individual (lane 10). scribed species C. dubliniensis, which previous studies have shown to be present in HIV-infected individuals in Ireland and Australia (13). Clearly C. dubliniensis is widespread, but because of the number of phenotypic characteristics shared between C. dubliniensis and C. albicans, it is possible that a significant proportion of C. albicans or C. stellatoidea isolates in many laboratory strain collections is C. dubliniensis. C. dubliniensis is isolated frequently but not exclusively from individuals infected with HIV (13; this study), and the majority, but not all, of the isolates studied so far have been from oral specimens (2a, 9). C. dubliniensis is susceptible to existing antifungal drugs, but resistance can develop rapidly (9). The evidence implicating the involvement of non-albicans Candida species in oral disease is growing (14). The increasing number of reports FIG. 2. Pulsed-field gel electrophoresis of DNA from reference and atypical isolates. The karyotypes shown in the lanes correspond to Candida isolates as for Fig. 1. of the recovery of C. dubliniensis from normal healthy and HIV-infected patients suggests that as well as being a constituent of the normal oral flora, C. dubliniensis is likely a significant cause of oral disease. This work was supported by Irish Health Research Board grant 41/96 and by the School of Dental Science, Trinity College, Dublin, Ireland. REFERENCES 1. Anthony, R. M., J. Midgley, S. P. Sweet, and S. A. Howell Multiple strains of Candida albicans in the oral cavity of HIV positive and HIV negative patients. Microb. Ecol. Health Dis. 8: Boerlin, P., F. Boerlin-Petzold, C. Durussel, M. Addo, J.-L. Pagani, J.-P. Chave, and J. Bille Cluster of atypical Candida isolates in a group of human immunodeficiency virus-positive drug users. J. Clin. Microbiol. 33: a.Coleman, D. Unpublished data. 3. Coleman, D., D. Sullivan, K. Haynes, M. Henman, D. Shanley, D. Bennett, G. Moran, C. McCreary, L. O Neill, and B. Harrington. Molecular and phenotypic analysis of Candida dubliniensis: a recently identified species linked with oral candidosis in HIV-infected and AIDS patients. Oral Dis., in press. 4. Coleman, D. C., D. E. Bennett, D. J. Sullivan, P. J. Gallagher, M. C. Henman, D. B. Shanley, and R. J. Russell Oral Candida in HIV infection and AIDS: new perspectives/new approaches. Crit. Rev. Microbiol. 19: Gallagher, P. J., D. E. Bennett, M. C. Henman, R. J. Russell, S. R. Flint, D. B. Shanley, and D. C. Coleman Reduced azole susceptibility of Candida albicans from HIV-positive patients and a derivative exhibiting colony morphology variation. J. Gen. Microbiol. 138: Kwon-Chung, K. J., W. S. Riggsby, R. A. Uphoff, J. B. Hicks, W. L. Whelan, E. Reiss, B. B. Magee, and B. L. Wickes Genetic differences between type I and type II Candida stellatoidea. Infect. Immun. 57: McCullough, M., B. Ross, and P. Reade Characterization of genetically distinct subgroup of Candida albicans strains isolated from oral cavities of patients infected with human immunodeficiency virus. J. Clin. Microbiol. 33:
5 964 NOTES J. CLIN. MICROBIOL. 8. McCullough, M. J., B. C. Ross, B. D. Dwyer, and P. C. Reade Genotype and phenotype of oral Candida albicans from patients infected with the human immunodeficiency virus. Microbiology 140: Moran, G. P., D. J. Sullivan, M. C. Henman, C. E. McCreary, J. Harrington, D. B. Shanley, and D. C. Coleman Antifungal drug susceptibilities of oral Candida dubliniensis isolates from human immunodeficiency virus (HIV)-infected and non-hiv-infected subjects and generation of stable fluconazole-resistant derivatives in vitro. Antimicrob. Agents Chemother. 41: Scherer, S., and D. A. Stevens A Candida albicans dispersed, repeated gene family and its epidemiologic applications. Proc. Natl. Acad. Sci. USA 85: Schmid, J., F. C. Odds, M. J. Wiselka, K. G. Nicholson, and D. R. Soll Genetic similarity and maintenance of Candida albicans strains from a group of AIDS patients, demonstrated by DNA fingerprinting. J. Clin. Microbiol. 30: Sullivan, D., D. Bennett, M. Henman, P. Harwood, S. Flint, F. Mulcahy, D. Shanley, and D. Coleman Oligonucleotide fingerprinting of isolates of Candida species other than C. albicans and of atypical Candida species from human immunodeficiency virus-positive and AIDS patients. J. Clin. Microbiol. 31: Sullivan, D. J., T. J. Westerneng, K. A. Haynes, D. E. Bennett, and D. C. Coleman Candida dubliniensis sp. nov.: phenotypic and molecular characterisation of a novel species associated with oral candidosis in HIVinfected individuals. Microbiology 141: Sullivan, D. J., M. C. Henman, G. P. Moran, L. C. O Neill, D. E. Bennett, D. B. Shanley, and D. C. Coleman Molecular genetic approaches to identification, epidemiology and taxonomy of non-albicans Candida species. J. Med. Microbiol. 44: Odds, F. C., J. Schmid, and D. R. Soll Epidemiology of Candida infection in AIDS, p In H. Vanden Bossche et al. (ed.), Mycoses in AIDS patients. Plenum Press, New York, N.Y. 16. Odds, F. C., and R. Bernaerts CHROMagar Candida, a new differential isolation medium for presumptive identification of clinically important Candida species. J. Clin. Microbiol. 32:
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